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  <title>Returns a description of the last connection error</title>
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    <li>Returns a description of the last connection error</li>
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  <div id="layout-content"><div id="mysqli.connect-error" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mysqli::$connect_error</h1>
  <h1 class="refname">mysqli_connect_error</h1>
  <p class="verinfo">(PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">mysqli::$connect_error</span> -- <span class="refname">mysqli_connect_error</span> &mdash; <span class="dc-title">Returns a description of the last connection error</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mysqli.connect-error-description">
  <h3 class="title">说明</h3>
  <p class="para">面向对象风格</p>
  <div class="fieldsynopsis"><span class="type">?</span><span class="type"><span class="type">string</span><span class="type"></span></span> <var class="varname"><a href="mysqli.connect-error.html">$mysqli-&gt;connect_error</a></var>;</div>

  <p class="para">过程化风格</p>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>mysqli_connect_error</strong></span>(): <span class="type"><span class="type">?</span><span class="type">string</span></span></div>

  <p class="para rdfs-comment">
   Returns the error message from the last connection attempt.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-mysqli.connect-error-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>

 
 <div class="refsect1 returnvalues" id="refsect1-mysqli.connect-error-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   A string that describes the error. <strong><code>null</code></strong> is returned if no error occurred.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-mysqli.connect-error-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1446">
   <p><strong>示例 #1 <var class="varname">$mysqli->connect_error</var> example</strong></p>
   <div class="example-contents"><p>面向对象风格</p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />mysqli_report</span><span style="color: #007700">(</span><span style="color: #0000BB">MYSQLI_REPORT_OFF</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/*&nbsp;@&nbsp;is&nbsp;used&nbsp;to&nbsp;suppress&nbsp;warnings&nbsp;*/<br /></span><span style="color: #0000BB">$mysqli&nbsp;</span><span style="color: #007700">=&nbsp;@new&nbsp;</span><span style="color: #0000BB">mysqli</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'fake_user'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'wrong_password'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'does_not_exist'</span><span style="color: #007700">);<br />if&nbsp;(</span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">connect_error</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Use&nbsp;your&nbsp;preferred&nbsp;error&nbsp;logging&nbsp;method&nbsp;here&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">error_log</span><span style="color: #007700">(</span><span style="color: #DD0000">'Connection&nbsp;error:&nbsp;'&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">connect_error</span><span style="color: #007700">);<br />}</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>过程化风格</p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />mysqli_report</span><span style="color: #007700">(</span><span style="color: #0000BB">MYSQLI_REPORT_OFF</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/*&nbsp;@&nbsp;is&nbsp;used&nbsp;to&nbsp;suppress&nbsp;warnings&nbsp;*/<br /></span><span style="color: #0000BB">$link&nbsp;</span><span style="color: #007700">=&nbsp;@</span><span style="color: #0000BB">mysqli_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'fake_user'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'wrong_password'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'does_not_exist'</span><span style="color: #007700">);<br />if&nbsp;(!</span><span style="color: #0000BB">$link</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Use&nbsp;your&nbsp;preferred&nbsp;error&nbsp;logging&nbsp;method&nbsp;here&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">error_log</span><span style="color: #007700">(</span><span style="color: #DD0000">'Connection&nbsp;error:&nbsp;'&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">mysqli_connect_error</span><span style="color: #007700">());<br />}</span>
</span>
</code></div>
   </div>

  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-mysqli.connect-error-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.mysqli-connect.html" class="function" rel="rdfs-seeAlso">mysqli_connect()</a> - 别名 mysqli::__construct</span></li>
    <li class="member"><span class="function"><a href="mysqli.connect-errno.html" class="function" rel="rdfs-seeAlso">mysqli_connect_errno()</a> - Returns the error code from last connect call</span></li>
    <li class="member"><span class="function"><a href="mysqli.errno.html" class="function" rel="rdfs-seeAlso">mysqli_errno()</a> - 返回最近函数调用的错误代码</span></li>
    <li class="member"><span class="function"><a href="mysqli.error.html" class="function" rel="rdfs-seeAlso">mysqli_error()</a> - Returns a string description of the last error</span></li>
    <li class="member"><span class="function"><a href="mysqli.sqlstate.html" class="function" rel="rdfs-seeAlso">mysqli_sqlstate()</a> - 返回上一次 SQL 操作的 SQLSTATE 错误信息</span></li>
   </ul>
  </p>
 </div>


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